Solve- 1010 - 990 using standard identity-

The correct option is A 999900 We can write, 1010=(1000 + 10) and 990=(1000 10) ⇒ 1010× 990= (1000 + 10)(1000 10) =1000^2 10^2 =1000000 100 =999900 ...

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Standard VII

Mathematics

(a+b)(a-b) Expansion and Visualisation

Solve: 1010 ×...

Question

Solve: $1010 \times 990$ using standard identity.

999900

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100000

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990000

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119900

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Solution

The correct option is A
999900

We can write, $1010 = (1000 + 10)$ and
$990 = (1000 - 10)$
$\Rightarrow 1010 \times 990 = (1000 + 10) (1000 - 10)$
$= 1000^{2} - 10^{2}$
$= 1000000 - 100$
$= 999900$

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Solve: 1010×990 using standard identity.

The correct option is A 999900 We can write, 1010=(1000+10) and 990=(1000−10) ⇒1010×990=(1000+10)(1000−10) =10002−102 =1000000−100 =999900

Solve: $1010 \times 990$ using standard identity.

The correct option is A
999900

We can write, $1010 = (1000 + 10)$ and
$990 = (1000 - 10)$
$\Rightarrow 1010 \times 990 = (1000 + 10) (1000 - 10)$
$= 1000^{2} - 10^{2}$
$= 1000000 - 100$
$= 999900$